Improvement in door-looks



PATENIED, Novias-'1118.67

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IMPROVEMENT IN DOORLOGKS.

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TO ALL WHO'M IT `MAY CONCERN:

Be it known-that I, REINHARD SCHADE, of the c-ity, county, and State of New York, have invented a new and useful Improvement in Locks; and I do hereby declare that the following isa full, clear, and exact description of the same, reference being. had tothe accompanying drawing, forming part of this specification, in which- Figure I is a plan view of the inside of the lock, the cap having been removed.

Figure 2 is a transverse section taken on the plane of theline :c x, fig..-1.

My invention consists in the `combination of a number of tumblers, each provided with three slots, and a passage-way from one slot to the-other, and each having diiIerently-formed lower edges, a bolt provided with a lug, which works in thc slots, a double-hit key, and springs for keeping the tumblers in the desired position, all

constructed and arranged-snbstantially as will be presently described. y

A designates the caseof the lock, the cap havingbeen removed. B is the bolt, and a its sha-nk, the latter of less thickness or depth than the former. This bolt -B lies against the back of the lock, and it is arrangedito slide between two guides, 6 b, which latter control the length of its shoot. The lower side of the shank of the bolt is provided wit'htwo recesses, which receive, respectively, the bits on each side of the key. c is a lug, rising from theface of the shank of the holt. C is the key, and it is provided with a bit on each side, whose cells are varied and different.. D D D D are the tumhlers. In` the present instance, they are four'in number, but more or less may be used, if desired. These tumhlers are arranged to lie upon the shank oi' the bolt, and are held in position by a stump, K, passing through an eye inthe end of each, and secured to the back plate of the lock. E designates a number of flat springs, one being secured to the rear end of each tumbler in such manner that it will press against the end ofthe case, and tend'to keep the tumbler to which it is attached thrown downward. Other styles of springs can be employed for the sameipurpose, if desirable.Y

Through each tumbler D there are made three slots, d ef, and each slot is connected with that next it by another slot or passage-way, g h, respectively. Theseslots are sufficiently large to hold the lug c within them. These passage-ways g h are ont at suehpoiuts through the walls, between the slots, that no two are in the same place, and each tumbler is 'diierently formed or cut on its lower edge. The bit of the key to be used for the rst turn is so formed that it will raise the several tumblers in such manner as to bring all the passage-ways g in line, so as to leavea clear track for, the lug c to pass through to the slot e, and so it is for the other bit for the second turn of the key to throw the lug c into the other slotvf.

TheA lug c has its rear edge of a V-shape, and the several walls between the slots on the forward edge are serrated, so that if any one of the tumblers should not be in exactly theright position', the corners of the lug will catch in the tumblers, and not have the capacity of sliding up the tumbler, however hard the key be turned.

It will he observed that a. nicety of construction of all the partsof the lock is necessary, yet the lock is 'very simple, and is no more likely to get out of order than the commonest style of lock. i

The .operation is as follows: The key is inserted so that Aits proper bit will first act on the tumblers, for raising them, in order to throw forward the bolt. To facilitate the proper insertion of the key, the key-hole may be made so that the key can 'be inserted 'in but one way; for instance, wherethe bits are not of thesame length. The bit enters the first recess; the bolt and the tumblers rest in the corresponding cells in the bit. On turning the key, the tumblersare raised, and, at the time that the passage-way g is clear, the bit throws forward l the bolt, thelug c passing through the passage-way g and into the slot e. The bit on the opposite side of the key operates upon-the tumblers until alike result is produced, namely, that of throwing the lug c into the slotf.,

In iig. 1 the lug is`shown as passing through the passageway L to enter the slot f, it having passed through the slot g, which, at such stage of the operation, is obstructed.'

This lock is, therefore, doublehootfl so called, and it is, practically, a lock which cannot be picked f I am aware of locks in which the tumblers have been so arranged that the bit of the key lifts them so thata. pinou the bolt will pass from one rec-ess to another.` I do not, therefore, claim broadly such construction of locks.

I am aware that a lock whose tumblers are operated by a double-bltted key, dissimile-r on its two sides, is not new, and I do not claim such arrangement.

What I do claimas my invention, and desire to secure by `Letters Patent, is-

The combination of the tumblers D, each provided with three slots, d e f, and passage-'way g L, double-bit key C, bolt B a, lug c, and springs E, or equivalents therefor, the-whole arranged and operating substantially as and for the purpose herein specified.-

REINHARD SCHADE'. Witnesses: l

M. M. LrviNesfroN, JOHN R. Coornn. 

